Interlocks Between Panels; Busbar Earthing Switch / Truck; Figure 64: Example Of Process Bus Application In Medium Voltage Switchgear - ABB UniGear Digital Commissioning And Testing Manual

I NT ER LO C K S BE T W EE N PA NE LS
5.2

Interlocks between panels

In UniGear Digital, the ordinary inter-panel wiring used for interlocking/tripping is replaced
with IEC 61850 GOOSE communication, using the existing Ethernet network inside switch-
gear. The realized logic in UniGear Digital over IEC 61850 GOOSE can be as follows:
– Busbar earthing switch / Busbar earthing truck
– Circuit breaker failure protection
– Logic bus bar protection
– Overpressure flaps inter-trip
– Arc protection inter-trip
– and other

Figure 64: Example of Process bus application in medium voltage switchgear

5.2.1

Busbar earthing switch / truck

– The busbar earthing switch can only be closed when all circuit breaker trucks in the rela-
tive busbar section are in the Test / Disconnected position (term used for disconnected
position is "Plug Out").
– When the busbar earthing switch is closed or the shutter for the lever is not in the closed
position, the circuit breaker trucks in the relative section cannot be moved from the Test
position to the Service position.
The Busbar earthing switch can be replaced with the earthing truck. Since the earthing truck
uses the same compartment as the circuit breaker, this one must be removed first to earth
the main busbars. Blocking conditions are identical with the closing conditions of the busbar
earthing switch. Enabling the signal for other circuit breaker trucks in the relative section
consists from the position of the earthing truck in the test or inserted circuit breaker inside
the compartment.
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AP PAR ATU S CO NTR O L T ES TI NG
1 VLG 5000 17 C